[Config] Fix the XML configuration example for enums #20329
Merged
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There is no
type="enum"
in the XML file loader.The bad example was introduced in #17910. However, the issue it was fixing was about a change in Symfony for PHP config files only. The Yaml and XML file loaders don't have any dedicated syntax for enums (but of course, the Yaml component itself does, which is what is used in the Yaml example)